The Knife of Dunwall and The Brigmore Witches are one larger title with continuing story and progression, they could've well been a standalone title by themselves.

These two DLCs are not compromised in any way because they are DLCs. There is no "we had to cut corners here because this is a DLC, it's inherently limited in scope." This is more Dishonoured, but not just more of the same but more of the pleasant surprises that the main game brought with each and every level. Except the game expects you to have finished the main game before, so they just throw you into the large sandbox from the beginning.